Maxitrol M511-3/4 Valve

The Maxitrol M511-3/4 is a modulating gas valve engineered specifically for technical performance in direct-fired, negative pressure burner systems. As an essential component of the Selectra series, this 3/4" NPT valve utilizes a solenoid-driven plunger to provide precise, instantaneous flame adjustment without the need for mechanical linkages or motor drives. Designed for a maximum inlet pressure of 1/2 PSI, the M511 requires an upstream pressure regulator to establish the high fire limit, while an adjustable orifice bypass handles minimum firing rates. It is fully compatible with Maxitrol SC10, Series 14, 24, 44, and 94 control systems, as well as SC11 signal conditioners for PLC integration. This valve maintains thermal stability across diverse HVACR industrial heating applications by delivering smooth gas flow modulation that responds immediately to voltage changes. Use this valve for reliable temperature control in makeup air units and kiln dry systems where consistent manifold pressure is critical.

• Precise Modulation: Delivers infinite flame adjustment without the failure points of mechanical butterfly valves or motors.
• Negative Pressure Optimized: Features a counter-spring design to ensure the valve stays closed against downward pull in pull-through burner configurations.
• System Compatibility: Seamlessly integrates with Maxitrol Selectra systems and standard 24V control logic for high-demand industrial environments.
• Adjustable Low Fire: Includes an internal bypass for manual calibration of the minimum firing rate during commissioning.

Does this valve require a separate regulator?
Yes, unlike the MR series, the M511-3/4 does not have an integrated regulator. You must install an upstream pressure regulator to set the maximum outlet pressure for high fire operation.

How do I set the high fire manifold pressure?
High fire is established by adjusting the separate upstream regulator while the Maxitrol amplifier is overridden to its maximum signal. Ensure you account for the negative pressure of the burner when taking your readings.

What is the maximum pressure limit for this valve?
The maximum operating inlet pressure is 1/2 PSI, with a maximum emergency exposure limit of 2.5 PSI. Exceeding these specifications can damage the main diaphragm.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.